Question 37 The U.S. Weather Bureau has a station on Mauna Loa in Hawaii that has measured carbon dioxide levels since 1959. At that time, there were 306 parts per million of carbon dioxide in the atmosphere. In 2005, the figure was 379 parts per million. Find the increase in carbon dioxide levels and the percent of increase. Round to the nearest tenth of a percent. Increase carbon dioxide levels: Percent increase:

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**Increase carbon dioxide levels:** 73 ppm

**Percent increase:** 23.9%

**Calculation Details:**

1. **Increase in CO₂ levels:**
   $$
   379\, \text{ppm} - 306\, \text{ppm} = 73\, \text{ppm}
   $$

2. **Percent increase:**
   $$
   \left( \frac{73}{306} \right) \times 100 \approx 23.8563\% \approx 23.9\%
   $$
Increase in carbon dioxide levels: 73 ppm Percent increase: 23.9%

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